Drain hopper



June 9, 1931. E. DUNCAN ET AL DRAIN HOPPER Filed Aug. 22, 1927 in 1 61? Zors.

Erskine Dun can .1 7? W 14m JroS Patented June 9, 1931 Y uarraa stares Parana orsics ERSKINE DUNCAN AND JOHN B. W. AMBROSE, OE TORQNIO, QNTAR-IO, CANADA DRAIN HOPPER Applieation filed August 2-2, Q27. Serial No. 214,650.

The principal objects of the invention are to overcome the difficulties met with 111 forming a water tight joint around drain hoppers or vent pipes protruding through 5 roof structures and to devise a simple and economical means for forming a water tight joint which will remain water tight indefinitely.

The principal feature of the invention r consists in providing amember adapted to be inserted into the roof structure and which has a cupped recess into which the membrane covering of the roof structure is sealed by an inserted cap placed over the roof membrane.

In the drawings, Figure l is a vertical sectional view showing our invention applied to a drain hopper.

Figure 2 is a half plan View of the sealing cap.

Figure 3 is a sectional detail showing a modified form of hopper for flat roof surfaces.

In the application of this invention, the roof structure which is here. shown of a monolythic type, has embedded therein at the upper end of a pipe line the tubular member 1 which is formed with a cup-shaped upper end having a horizontal shoulder 2 and an enlarged conical-shaped portion 3 which terminates in a horizontal flange 4:- The uncture edge 5 between the flange dand the conical recess is rounded at a suitable radius.

The flange 4: is preferably bedded in the monolyth mass 6 so that its top surface is flush with the top surface of the roof and over this monolyth surface is placed a membranous covering 7, such as tarred felt or other suitable material. The covering 7 extends over the flange 4 and is stretched into the conical recess formed by the walls 3.

A circular cap 8 is formed with a conical boss 9 which is bevelled at a corresponding angle to the walls 3. This is fitted into the conical recess and forms a sealed joint with the membranous material 7. The bottom edge 10 of the cap rests upon the shoulder 52.

The flange 11 of the capextends over the flange 4C and is preferably provided with a plurality of perforations 12 and a raised central flange 13 extends around a counterbored recess 14.

A suitable guard to prevent large pieces of material washing into the drain pipe is inserted into the recess 14. In Figure 1 this guard is shown as a dome-shaped structure 15 having a plurality of longitudinal slots 16 therein which allow water to flow in from V the roof top. 1

In Figure 3 the guard member is shown with a slightly concaved grid 17 which is adapted for level roof or floor surfaces.

After the cap 8 is placed in position the upper mastic covering 18 is placed over the membranous material 7 and is flushed up around the vertical flange 13. This material extends through the perforations 12 in the flange 11 ofthe cap and binds the cap securely in place.

The device is shown as applied to a drain pipe but it will be readily seen that the cap member may be extended upwardly above the roof surface to form the extension for a ventilator pipe or any other tubular extension desired.

It will be seen that the membrane sheet 7 leads downwardly into the cup structure and the bottom of the cup leads into the tubular drain, consequently if by chance water should find entrance around the top of the cap through the mastic covering, it will follow the surface of the membrane into the cup and drain downwardly, thus absolutely avoiding the possibility of leakage into the building anywhere round the pipe.

What we claim as our invention is:

1. In a roof structure, the combination with a thin waterproof membrane covering therefor, of a tubular member having a conical walled cup at the upper end bedded in the roof surface and having the membranous mastic roof covering extending over the lateral flange of the cap and the membrane and locking the cap in place.

2. In a roof structure, the combination with a thin Waterproof membrane covering therefor, of a tubular member having a conical Walled cup at the upper end bedded in the roof surface and having the membranous roof covering extending over the edge of the cup and downwardly thereinto, a cap having a flange resting on the top of the membranous roof covering and a conical boss extending down into the cup and binding the edge portions of the thin roof covering against the conical Wall of said cup, said cap being formed with a flange extending upwardly above the level of its lateral flange, said cap flange having a plurality of openings therethrough in peripherally spaced relation to expose the membrane, and a mastic roof covering extending over the said cap flange and entering said flange openings and locking said cap and membrane together.

ERSKINE DUNCAN. JOHN R. WV. AMBROSE. 

